In the footsteps of Einstein , Sagan and Barnard : Identifying South Africa ’ s most visible scientists

FUNDING: National Research Foundation (South Africa) Highly visible scientists are increasingly recognised as influential leaders with a special role to play in making science part of mainstream society. Through consultation with a panel of 45 experts working at the science–media interface, we sought to identify the most visible scientists currently living and working in South Africa. In total, 211 scientists – less than 1% of the scientific workforce of the country – were identified as visible in the public sphere. The demographic profile and institutional spread of South Africa’s visible scientists suggest that more should be done to increase the diversity of scientists who are publicly visible. Although only 8% of South Africans are white, 78% of the group of visible scientists were white, and 63% of the visible scientists were men. Only 17 black women were identified as publicly visible scientists. While visible scientists were identified at 42 different research institutions, more than half of the visible scientists were associated with just four universities. Recent controversies surrounding the two most visible South African scientists identified via this study, and the potential implications for fellow scientists’ involvement in public engagement, are briefly discussed.


Introduction
A dominant trend in science over the past century is the move away from a closed system in which scientists worked largely in isolation, to a more transparent system in which scientists leave the proverbial ivory tower to engage with society. 1 Today, effective communication between scientists and diverse public audiences is recognised as an important characteristic of a modern, democratic knowledge society. 2 Consequently, the notion that scientists should engage with affected publics and debate the social implications of their work openly has become a central element of the moral economy of modern science.However, in a world where science has become increasingly competitive, contested and politicised 3 , the borders between science and politics are blurring and science is more closely coupled with politics and mass media 4 .As a result, public communication of science has also become a tool to compete for public attention and political support 5 and scientists' motivation to seek public visibility may be complex and diverse.
The growing participation of scientists in public life has been accompanied by a growth in the presence of scientists in popular culture. 6Iconic scientists who have shaped the societal discourse about science include people such as Charles Darwin, who was deemed a master of public relations 6 and Albert Einstein, Time magazine's person of the last century 7 .Towards the end of the 20th century, people like Stephen Jay Gould, Richard Feynman, Carl Sagan and Jane Goodall rose to fame, while present-day science popularisers such as Richard Dawkins, Stephen Hawking, Neil deGrasse Tyson, Brian Greene and David Attenborough continue to enjoy star status.As science continues to expand, it becomes harder for scientists to be visible in public life and the relative invisibility of scientists has emerged as a major concern.
Scientists' academic visibility within their fields of research depends on scholarly publication and citation rates, but public visibility depends on media exposure 8 , which may result from a combination of academic work and involvement in debates and activities outside science.Scientists' active participation in public science communication (for example, presenting popular talks at schools and science centres) is not sufficient to ensure a high public profile.Public visibility requires an amplification of the individual scientist's views and voice -something that would be virtually impossible to achieve without the strategic use of traditional and digital media platforms. 6,9ecause of the decisive role of the media in achieving public visibility, we identified the most visible scientists in South Africa with the help of a panel of science-media experts, that is, science writers and researchers in the field of science communication and/or media studies.
The case of Carl Sagan is frequently cited as an example of how a high public profile can detract from a scientific career.It is widely believed that Sagan's nomination to the US National Academy of Sciences was voted down by his peers, because they did not approve of his celebrity status. 6Subsequently, scientists' fears that public visibility could penalise them career-wise became known as the 'Sagan effect'.Interestingly, Sagan himself did not perceive that he was penalised by his peers as a result of his high public profile. 8spite lingering ambivalence amongst some scientists about the desirability of achieving a high public profile 10 , media interactions -leading to public visibility -have become an integral part of the role of being a scientist and are particularly expected of scientists in leadership roles 11 .Because of their ability to spread their ideas, influence decision-makers and promote scientific culture, high-profile scientists are considered by some as the new academic elite 6 and increasingly recognised as powerful socio-political influencers and opinion leaders who

Research Article
Identifying South Africa's most visible scientists Page 2 of 9 have power within and outside the science arena. 12Furthermore, highprofile scientists have been shown to outperform their less visible peers in terms of scientific productivity 13,14 and their media visibility may well boost their scientific impact 15,16 .That is why we had the goal of identifying and locating the most visible scientists in South Africa, with a special focus on their population group, gender, age, employment sector and research fields.This approach is beneficial in terms of identifying what kind of scientists become publicly visible in South Africa and testing whether the publicly visible scientists, as identified in the current study, are representative of the broad South African society.Furthermore, the study has the potential to generate recommendations for increasing the visibility of scientists in South African society.
While the scientific community may have become more accepting of public visibility, some scientists remain concerned about the potentially damaging effects of a high public profile on their scientific reputations. 10,17heir concerns are exacerbated by apprehensions about the risks presented by social media. 18Furthermore, the rise of public relations approaches in institutional science communication 19 has resulted in some criticism of the efforts of some institutions and scientists to gain attention for their work 5 .The inevitable tensions between increasing expectations to engage with public audiences and lingering reservations about the potential consequences of doing so, sustain scientists' ambivalence about public visibility. 10Given these conflicting prospects in terms of public visibility, it becomes even more important to understand how scientists themselves experience and respond to opportunities and demands to communicate publicly about their research.

The South African context for public science communication
During the Portuguese colonial rule in Brazil from the 16th to 18th centuries, science was typically suppressed and only the rulers had access to scientific knowledge as a consequence of their links with Europe. 20This was also the case during British colonial rule in South Africa (1795-1910).The country's science system continued to serve mostly its white population and government interests 21 during the racially segregated apartheid regime (1948-1994), thereby continuing to isolate the majority of the country's citizens from science and suppressing the communication of scientific ideas 22 .Despite international isolation, boycotts, sanctions and travel restrictions during the apartheid years, the South African science base continued to strengthen and the country developed advanced facilities and expertise in fields such as geology, mining, energy, nuclear science, space science and military science, as well as in agriculture and veterinary sciences. 23ring the apartheid years, only one South African scientist became a household name locally and abroad: Christiaan Barnard.Christiaan Barnard (1922-2001) shot to global fame after he performed the first human-to-human heart transplant in Cape Town on 3 December 1967.Barnard's article describing the surgery was published within 4 weeks of the event 24 and became one of the most cited articles in the field of cardiovascular medicine 25 .The dramatic nature of this medical milestone and the subsequent events captured the attention of the world and they were front page news for some time.It is likely that Barnard's youth and charisma enticed ongoing media attention, but it has also been suggested that politicians exploited him to improve South Africa's image at a time when the country was politically and socially isolated. 25uth Africa has delivered other celebrated academics who were highly regarded within science, but they -arguably -never became house hold names.Names that come to mind include the visionary veterinary researcher Sir Arnold Theiler and the eminent and much-loved palaeoanthropologist Phillip V. Tobias.
The arrival of democracy in 1994 changed South African society fundamentally.In this new dispensation, science and technology were seen as essential instruments for economic growth and social development. 26In addition to a new political and social landscape, there was an expectation that science should also be democratised.The science base at the time of transition to democracy was based on only about 10% of the population.
The country now had a much larger pool of talent on which to draw, but developing this expertise would require extensive educational reform, as well as intensive teaching and mentoring in order to correct the injustices and imbalances of the past. 27Consequently, new government policy emphasises the need for more effective engagement between science and society, and the government is urging the country's scientists to become actively and visibly involved in public science communication in order to make their work accessible, meaningful and relevant to all South Africans, in particular historically disadvantaged communities. 28hese calls are in line with increasing demands on scientists to engage pro-actively with a wide range of public and policy audiences, including entering into meaningful dialogue with society about uncertainty in science and the ethical implications of cutting-edge research. 29e Year of Science and Technology 1998 -or 'Yeast 98' as it was popularly known -was the first nationwide science communication initiative in democratic South Africa.This public communication campaign consisted of exhibitions, popular science talks and interactive workshops that moved around the country.Subsequently, the government has organised annual science and technology weeks and contributed funding to various science centres and science festivals.In 2002, the Department of Science and Technology established the South African Agency for Science and Technology Advancement (SAASTA) as a business unit of the National Research Foundation, with the specific aim to advance public awareness, appreciation and engagement of science, engineering and technology in South Africa.Early in 2015, the Department of Science and Technology announced a new strategic framework for public science engagement 28 , which is intended to coordinate and encourage science promotion, communication and engagement activities at a national level.The stated objectives of the framework blend promotional aims (popularising science to awaken interest and global profiling of South African science) and engagement goals (developing a critical public that participates actively in the national discourse on science and technology).
Achieving the government's ambitious public engagement goals will require not only the support of South Africa's institutional science system, but also the participation of as many individual scientists as possible.However, in order to design effective strategies and support structures to mobilise scientists in terms of public science communication, we must understand the motivations and barriers that influence their willingness and ability to get involved.
Several scholars have emphasised the significance of understanding how scientists themselves perceive public communication and their roles in public life as a first step in developing effective public science engagement strategies. 30,31While the public communication of science, including the factors that influence scientists in terms of their communication with lay audiences, has attracted considerable research interest over the last few decades, local studies were mostly limited to explorations of public science literacy and attitudes to science. 32Only two studies investigated interactions between South African scientists and journalists 33,34 and both highlighted gaps in understanding and skills deficits on the sides of both journalists and scientists.
Currently, we still know very little about the motivations and barriers that influence South African scientists' public communication behaviour, and how they perceive the benefits and risks associated with a high public profile.It is hoped that future research will help to inform new policies and support structures aimed at encouraging and incentivising scientists towards more visible participation in public life.The current study is a first step towards achieving this goal.Consequently, the research question steering the current study is: Who and where are the visible scientists in South Africa?Background information about these scientists -including their demographic profiles, fields of research and institutional affiliations -provides new perspectives on the factors that determine scientists' visibility in the public sphere within South Africa's unique science arena and socio-political context.

Methodology
For the purpose of this study, public science communication is defined as the communication of scientific information -by scientists -to people not involved with research in the same field.Visible scientists were identified as those scientists who were considered to be known to the South African public -at least to some extent -by one or more members of a panel of individuals working at the interface between science and the media.
A number of factors -including age 35 , gender 36 , position 37 , discipline 38 and organisational culture 39 -have been shown to influence if and how scientists communicate with public audiences.As such, the aim of the current study was to identify publicly visible scientists in South Africa, along with relevant background information about them that might help explain their public visibility.
After considering various options for identifying publicly visible scientists (such as selecting recipients of science engagement awards, choosing scientists based on the frequency of media appearances or doing a public opinion survey), asking a panel of science-media experts (similar to the approach followed by Rae Goodell in her landmark study of visible scientists in 1975 8 ) was deemed to be the most feasible and effective.
Goodell points out that using a panel of respondents -each with their own experiences of scientists interacting with the public -allows the researcher to draw indirectly on a number of indicators of visibility.
Based on the first authors' experience of 25 years in the South African science communication arena, panel members were selected to represent local expertise in science journalism, popular science writing, public science engagement, and research in the field of science communication.To avoid bias in favour of visible scientists at a specific research organisation, no corporate communicators associated with a specific institution (university or science council) were included in the panel; this exclusion was not applied to researchers based at institutions.
Potential panel members were contacted via email (with reminders via email and social media) in order to ask them to help identify scientists who they perceived to have achieved some level of public visibility in South Africa.In line with the approach used by Goodell 8 , the request was kept brief and simple; respondents were asked to be liberal in their definition of a scientist.Following a short introduction to the research project, one simple question was asked: 'Please write down the names of about five to ten scientists -currently living and working in South Africa -who you consider to be publicly visible.' Respondents were asked to name a maximum of 10 scientists for two reasons: (1) to ensure that it would not be a time-consuming task, and also (2) to encourage them to submit names of only the scientists who were well known in the public sphere. Of

The number of visible scientists in South Africa
According to 2014/2015 statistics, South Africa has 25 300 researchers (excluding doctoral students and postdoctoral fellows at higher education institutions). 40Researchers are defined as professionals engaged in the conception or creation of new knowledge, products, processes, methods and systems, and in the management of the projects concerned. 40 The 'top 18' -i.e.scientists who were mentioned by four or more panel members -are listed in Table 2, along with their research fields and institutional affiliations.This group of 18 scientists can therefore be defined as having achieved a significant level of public visibility.

South Africa's visible scientists per population group
While white scientists constitute 59% of the current scientific workforce of the country 40 , 164 of the visible scientists in this study (or 78% of the visible group) were white.Black researchers (consisting of African, coloured and Indian researchers) constitute 42% of the scientific workforce. 40Only 47 black researchers (22% of the group of 211 visible researchers) were identified as being publicly visible.
The 164 white scientists identified as publicly visible represent 1% of the white scientists in South Africa, while the 47 black scientists represent only 0.4% of the black scientists in the country.The 18 most visible scientists (Table 2) are made up of 11 white and 7 black scientists.

The gender balance of South Africa's visible scientists
The male:female ratio in South Africa's scientific workforce 40 is 56% male to 44% female.Men outnumber women in the scientific workforce, but were even more dominant amongst the group of 211 visible scientists identified in the current study, with 133 (63%) men and 78 (37%) women.Similarly, 11 (61%) of the 18 most visible scientists (as listed in Table 2) were men.There were only 17 black women (8% of the visible group) amongst the visible scientists.

Age and seniority profile of the most visible scientists
All of the most visible scientists identified in this study (i.e. the top 18 scientists mentioned by four or more of the respondents) were born between 1947 and 1971, meaning that -on their birthday in 2016 -their ages ranged between 45 and 69 years, with an average age of 52 years.
Only two people in this group of scientists were younger than 50 years at the time.
In terms of seniority, 14 of the 18 most visible scientists (77%) were full professors, while 1 (who was also the youngest in the group) was an associate professor.Two of the remaining three scientists held a PhD, but were not employed in the higher education sector.In total, 160 of the 211 visible scientists (76%) in the country were employed in the higher education sector, with 22 (10%) employed in science councils and 12 (6%) in the not-for-profit sector.There were relatively few visible scientists in industry (only 7, or 3%), and even fewer (only 5, or 2%) in government.Five of the visible scientists were retired and no longer affiliated to a specific institution.

Too few black and women scientists in the public eye
Only 211 of the 25 300 South African researchers 40 -less than 1%were identified as being publically visible within South Africa.Within this group, black and female scientists were proportionally underrepresented.
Black scientists make up 42% of the researchers in South Africa, but only 33% of the visible scientists in this study.Similarly, women constitute 44% of the research workforce, but only 34% of the visible group.
When these figures are seen in the context of the overall population demographics of the country, the underrepresentation of black and female scientists is even more prominent.According to recent population estimates from Statistics South Africa 41 , the total South African population stands at 55.9 million people, of whom 92% are black and 51% are female.White people constitute only 8% of the overall South African population, but 78% of the visible scientists in this study (164 out of 211) were white.
Given the political past of South Africa, one could argue that it is encouraging that there are 47 black scientists (including 17 women) deemed to be publicly visible at the present moment in South Africa.A deeper understanding of their experiences of public communication of science could reveal the best way forward to increase the participation of black scientists in public communication about their research.
In terms of the effect of gender on careers in science, the dominance of men at higher levels in the academic hierarchy is well documented, as is the evidence for a general structural bias against women in science 42 , while female scientists in Africa face a particularly dire situation 43 .Women also face particular barriers in terms of getting involved in public science engagement and may even be advised to avoid these activities or risk not being taken seriously by their male peers. 44There is also evidence that active involvement in public engagement is generally valued in a man's portfolio, but criticised when part of a woman's portfolio. 45Given the persistent stigmatising of women who are actively involved in public science communication, it is no surprise that some female scientists avoid or downplay personal involvement in these activities and understandable that nearly two thirds (133 out of 211) of the visible scientists identified in this study were men.In contrast, some studies show that, despite the normative sanction from their peers, female scientists are significantly more involved in reaching out to external audiences compared with their male colleagues. 31e dominance of male scientists in public life is not unique to South Africa.For example, there were only two women -Margaret Mead and Jane Goodall -in the list of the 20 most visible scientists identified by Goodell 8 .Similarly, Fahy 6 included only one woman -Susan Greenfieldin his chronicle of the lives of high-profile scientists of today.
However, in South Africa, increasing the gender and racial diversity of the science workforce (i.e.attracting young women and black youth to research careers), is an important objective of public science communication.Publicly visible black and female scientists can act as role models for young people and help to shatter the racial and gender stereotypes in science.It is therefore important to understand how local black and female scientists respond to demands for increased public science engagement, and what specific factors encourage or constrain their involvement.

Public visibility increases with seniority
Research has shown that journalists often prefer to interview scientists who are more senior and likely to be in influential positions and regarded as leaders in their fields, and therefore it takes time for scientists to achieve public visibility; also senior scientists are more likely to engage with the public and be better able to deal with the potentially negative responses that may result from public visibility from time to time. 8,35,38,46his contention is also evident in the age profile of the 18 most visible scientists identified in this study who were between 45 and 69 years old, with an average age of 52 (and only two researchers younger than 50).These findings are in line with the higher levels of public communication involvement of more senior researchers who have been demonstrated in, for example, Switzerland 36 and Argentina 37 .It has also been suggested that scientists should earn a scientific reputation before venturing out into the public arena. 8It is therefore not surprising that 14 of the 18 most visible scientists were full professors, which allows them the credibility and protection of a high standing in the academic world.

The effect of organisational culture on public visibility
In today's global research arena in which universities increasingly have to justify research spending and compete for the attention of funders and partners, institutions are looking for ways to demonstrate their social relevance and impact via the public engagement activities of their researchers.Consequently, organisational culture, policies, norms, reward structures, institutional expectations and the quality and availability of communication support services have been shown to influence public visibility of researchers. 47,48Scientists also strive for recognition within their institutions and may pursue public and media visibility in order to establish and boost their own reputations. 19While organisational culture can support scientists' efforts to engage external audiences, institutional constraints mean that scientists may also be penalised for their efforts to become publicly visible. 1,39n this context, it is interesting to note that more than half of the 211 publicly visible scientists identified via this study were employed at just four South African universities.These universities -Cape Town, Witwatersrand, Pretoria and Stellenbosch -are all research-intensive universities ranked amongst the best higher education institutions in the country. 49It is reasonable to assume that the organisational culture and policies, as well as the public relations support, that are available at these top universities, play a role in helping the scientists who work there to achieve and sustain higher public profiles.Apart from these four universities, the rest of the visible scientists in the country were thinly spread across the science sector, with many universities and other research organisations featuring just one publicly visible scientist.There were also several universities and science councils, as well as national and provincial government departments, missing from the list of institutions hosting visible scientists, meaning that none of the 45 media panel members mentioned a visible scientist at these institutions.

The effect of discipline on public visibility
There are many reasons why scientists' efforts to communicate with public audiences about their research may be affected by their own field of research.For example, the public tends to be more interested in topics that are close to everyday life and resonate with human interest. 8lso, the esoteric nature of natural and physical sciences, and the highly codified language used in these fields, make it challenging to present new ideas to lay audiences. 13,50Researchers working in some fields may perceive a strong moral duty to make their work publicly accessible, while other disciplines are governed by more restrictive norms. 31e number of visible South African scientists per broad scientific field, as identified in the current study, were in line with these findings and also reflected the scientific opportunities and priorities of the country.For example, given the country's rich biodiversity 51 and unique fossil heritage 52 , it is not surprising that there were many biologists and palaeontologists amongst the visible scientists (Table 4).Similarly, given the local health challenges 53 , it is understandable that HIV, tuberculosis and public health dominate as areas of expertise amongst the publicly visible health researchers.The importance and relevance of social scientists in a developing country context is underlined by the fact that nearly a quarter of the publicly visible scientists were social science scholars working on topics such as politics, economics, gender studies, communication, criminology, violence, trauma and reconciliation.
Amongst the 18 most visible scientists in the country, more than half (10) were from the natural sciences (of which 4 were in fields related to palaeontology), 5 were in health sciences, and 3 in physical sciences.Notably, there were no social scientists or engineers in this group of the most visible scientists.This finding indicates that scientists in these fields have therefore not achieved a similar level of visibility compared with the best-known experts in the country in fields such as palaeontology, climate change and HIV/Aids research.

Berger and Noakes -blending science celebrity and notoriety
Goodell 8 reflects on the discomfort that some scientists experience when peers or colleagues attain high public profiles, including that they are sometimes seen as irritating and even hazardous because of their tendency to break old rules of protocol in the scientific profession, question old ethics and defy old standards of conduct.She adds that scientists are often concerned that high-profile colleagues will mislead the public when they speak outside their areas of expertise -as they often do.These observations about visible scientists -and the ways in which other scientists respond -are reminiscent of recent controversies that have surrounded the two most visible scientists identified in this study -Lee Berger and Tim Noakes.
There is little doubt that controversy is a catalyst for public visibility 8 and that visibility in the mass media feeds further visibility via the feedback loops of media attention 54 and reciprocal intensification 39 .Lee Berger and Tim Noakes have both experienced considerable public and peer criticism that has certainly boosted their public visibility.Both of them are acclaimed, senior scientists: Lee Berger is rated as an 'internationally acclaimed researcher', and Tim Noakes as a 'leading international researcher' according to the evaluation and rating system of the National Research Foundation (as at 14 December 2016).Seniority and status have been shown to help scientists cope with critical storms that may result from high media visibility. 8,46en, towards the end of 2015, Lee Berger went public with his theory that Homo naledi was a human ancestor that in all likelihood deliberately buried its dead 55 , the discovery became mired in controversy and elicited societal and scientific criticism 56 .Amongst other things, Berger was accused of rushing his research to please the media 57 and even of promoting racist pseudoscience intent on showing that Africans were sub-human 58 .In a press conference on 9 May 2017, Berger and his research team not only announced that many more of these fossils have been discovered, but also dated them and presented further claims that the species could have shared cognitive traits with modern humans, as their hands were capable of making and manipulating tools.
Tim Noakes' advocacy in favour of a diet low in carbohydrates and high in fat 59 has resulted in an outright diet war between passionate supporters, mostly members of the public, and fierce critics, who were mostly in the scientific community.Fellow scientists have challenged the scientific basis of the low-carbohydrate-high-fat diet 60 , while colleagues at the University of Cape Town have accused him of making outrageous and unproven claims and have distanced themselves from his dietary recommendations 61 .
Two South African science journalists -Sarah Wild and Alex Eliseevweighed in on the Berger and Noakes controversies, and how they have played out in the public sphere.Wild 62 claims that so-called 'rock star scientists' -such as Berger and Noakes -are populists and that their style of communication -oversimplifications, appeals to emotions and anecdotes -threatens public trust in science (should they later be proven wrong).Eliseev 63 disagrees; he posits that to get people interested in science, you have no choice but to simplify.Furthermore, scientists routinely disagree and will debate fossil finds and diets for years to come.
Eliseev describes Berger as one of those rare scientists with flare and personality -the X-factor -with a talent to make science exciting and entertaining.He sees no problem with Berger's ability to use the media to his advantage, adding that it helps to fund research and has other positive spin-offs for society.
Like Berger and Noakes, many high-profile scientists have on occasion experienced damaging criticism from peers.While their strong track record may help them to weather these storms, they are not oblivious to these attacks on their credibility, and often fear the criticism from their peers. 8This effect is evident in responses from Noakes after he was found not guilty of unprofessional conduct, following a drawn out disciplinary hearing by the Health Professions Council of South Africa.Commenting on the letter by University of Cape Town academics, Noakes told a journalist 64 : 'What that letter did was to isolate me from my university and my faculty; from the university unit that I had started and from the Sports Science Institute of South Africa which I had also helped found'.About the drawn-out hearing itself, he said: 'My wife and I simply could not escape it -we spoke about it endlessly, wondering why it had come about; how we might have avoided it; how heartless were the people who were driving it and we even wondered at times whether our lives might be in danger.' Controversies like these -characterised by an intense focus on a specific individual -may discourage other South African scientists from going public with their research findings.It is therefore important to understand how visible scientists cope with and respond to controversy, and to discover what lessons other scientists can learn from their experiences.

Study limitations and suggested future research
The present study has important limitations.To identify visible scientists in South Africa, only experts working at the science-media interface were considered, only 45 of them responded to the request, and the respondent group was predominantly white.In addition, these experts were asked to name only between 5 and 10 scientists.There might be other respondent groups to consider that could extend the number of http://www.sajs.co.za Volume 113 | Number 11/12 November/December 2017 visible scientists in South Africa.Furthermore, only names of visible scientists were gathered; the background data were sourced from desktop research.These findings lead to interesting new research questions.For instance, it would also be prudent to investigate the communication culture and support structures at the four universities that are home to more than half of the publicly visible scientists identified in this study, in order to elucidate the successful communication drivers that could possibly be adopted by other research organisations across the country.A better understanding of the communication behaviour and experiences of high-profile scientists who have endured intense public and peer scrutiny -as is the case with the two most visible scientists in this study -will further aid our understanding of the factors that influence and shape the interaction between scientists and their diverse publics in a country like South Africa.

Conclusion
Despite the above-mentioned limitations, the present study has important implications.Given the science transformation goals of the country -especially in terms of attracting more black youth into science and demonstrating the social relevance of research -it is of importance to increase the visibility of black scientists and to raise the profile of black intellectuals in the country.To achieve these goals, a new generation of black scientists must be equipped with the confidence and skills to become publicly visible via mass media platforms.Similarly, more female scientists must be mobilised, motivated and incentivised to communicate and engage with the broad South African society.Therefore, in order to reach the goals outlined in its ambitious public engagement framework, the South African government will need to broaden the base of scientists who become visible in the public eye.Investigations into the profiles and experiences of high-profile scientists highlight the factors that influence public visibility and help to inform future policies designed to support public science communication.

2 South African Journal of Science
http://www.sajs.co.za Volume 113 | Number 11/12 November/December 2017 the 63 experts who were approached, 45 (71%) responded to the request by sending names of scientists who they perceived to be publicly visible in South Africa.Of these 45 respondents, 41 are white (4 are black) and 29 are women (16 are men).The industry sectors represented by panel members are reflected in Table1.
Ethical clearance for this study was obtained from the Research Ethics Committee: Human Research (Humanities) at Stellenbosch University (reference number SU-HSD-004069).
(The terms 'researcher' and 'scientist' are used interchangeably in this article.)Ofthese 25 300 researchers who make up the scientific workforce, only 211 scientists (less than 1%) were identified as being publicly visible by the 45 respondents who constituted the media panel for this study.In total, 367 names were suggested, representing 211 individuals once duplicate mentions were removed.Given that the maximum number of names expected if each respondent listed 10 unique names would be 450, the list of 367 names represented 82% of the expected maximum.Only 46 of the 211 scientists were mentioned by two or more panel members.This means that 165 scientists (78% of the total group) were mentioned by only one person on the media panel, suggesting that most of the visible scientists identified in the current study are not genuinely publicly visible, but rather known as a result of limited media exposure, with possibly only one journalist.Professor Lee Berger -a palaeoanthropologist at the University of the Witwatersrand -emerged as the most visible scientist in South Africa with 27 mentions.

Table 1 :
Science-media panel respondents (n=45) Only one of the top 18 most visible scientists did not have a PhD.http://www.sajs.co.za Volume 113 | Number 11/12 November/December 2017 http://www.sajs.co.za Volume 113 | Number 11/12 November/December 2017 South Africa's visible scientists per employment sector A breakdown of the institutions at which the visible scientists work (

Table 3 )
revealed that just more than half (109, or 52%) of the 211 publicly visible scientists identified in this study were working at just four universities.A total of 157 out of 211 (74%) were employed at just 10 institutions.The University of Cape Town was home to most of the high-profile scientists in South Africa, followed by the University of the Witwatersrand, University of Pretoria and Stellenbosch University.The rest of the visible scientists were spread over 42 other research institutions, of which 27 institutions were represented by only one scientist.Notably, there are many more research organisations (science councils and universities) in the country from which not a single scientist was identified as being publicly visible.

Table 3 :
The top ten South African institutions in terms of the number of publicly visible scientists

Table 2 :
Publicly visible scientists mentioned by four or more members of the science-media panel Table4provides a breakdown of the visible scientists in South Africa according to broad research field.Most of the visible researchers in South Africa, as identified in this study, worked in the natural sciences and it is interesting to note that this group included eight researchers in the field of palaeontology.The combined disciplines of social sciences, humanities and arts represented the second biggest group of visible scientists, followed by health sciences, physical sciences and environmental sciences.Only 12 engineers (6%) were identified as publicly visible.

Table 4 :
Disciplinary spread of publicly visible scientists in South AfricaNatural, biological and agricultural sciences (including animal and plant studies, microbiology, conservation, marine biology, biotechnology, genetics, agriculture, food security, palaeontology and palaeoanthropology) 64 7 South African Journal of Science http://www.sajs.co.za Volume 113 | Number 11/12 November/December 2017